how do you stop incoming calls from dropping and interrupting the call you are currently on

[AC Question]

Its very rude to be on a call and a call comes in and drops the call you are on

 

[B. Diddy]

Welcome to Android Central! Which phone? Pretty much all wireless carriers should provide Call Waiting as a feature (at least in the US). Open your Phone app, tap Menu>Settings>Call Settings>Additional Settings, and see if Call Waiting is turned on.